JP2011166938A - Discharge system of electric circuit - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a discharge system of an electric circuit which appropriately lowers a potential at each portion of the electric circuit at emergency. <P>SOLUTION: The discharge system is connected to two capacitors 31, 37 and is applied for the electric circuit to be operated by power supplied from a storage battery. When collision of vehicles is detected, power supply from the storage battery to the electric circuit is stopped and the charges stored in the capacitors 31, 37 are forcedly discharged by a discharge circuit 40 connected to the electric circuit through the operation of a switch 50. As a discharge circuit 40 a circuit is employed wherein the switch 50 and a resistor 41 are connected in series, and the connected one is connected in parallel to each of capacitors 31, 37. The anode of the first capacitor 31 is connected to the switch 50 through a first connection circuit 42 and the anode of the second capacitor 37 is connected to the switch 50 through a second connection circuit 43. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a discharge system for forcibly discharging charges stored in an electric circuit.

  In recent years, various devices composed of electric circuits such as a control device for controlling the operation of an electric motor have been proposed and put into practical use. When an abnormality occurs in such a device, it is frequently used to forcibly stop power supply to an electric circuit for the purpose of preventing malfunction of a control target. In addition, in a device in which an electric circuit includes a capacitor, such as that described in Patent Document 1, in addition to forcibly stopping power supply to the electric circuit when the device is abnormal, the electric charge stored in the capacitor is forcibly stopped. There has been proposed a circuit in which a discharge circuit for discharging is connected to the electric circuit (see, for example, Patent Document 1).

  The device described in Patent Document 1 has an electric circuit for driving a motor for driving a vehicle. And when the collision of a vehicle is detected, while the connection of the storage battery for electric power supply and an electric circuit is interrupted | blocked, the same electric circuit is connected to an alarm and a headlight. In this device, the power supply to the electric circuit is cut off at the time of a vehicle collision, and the electric charge stored in the capacitor of the electric circuit is discharged by consumption by the alarm device or the headlight.

JP 2007-181308 A

  By the way, for example, when the device itself is damaged or a circuit element fails, the electric circuit may be divided into a plurality of circuits due to an abnormality in the electric circuit itself. Therefore, in an apparatus comprising an electric circuit to which a plurality of capacitors are connected, when an abnormality occurs, the electric circuit is divided into a plurality of circuits, and when the capacitors are connected to the circuits separately, the capacitors ( Specifically, the connection portion of the anode) is maintained in a state where the potential is kept high after the power supply is forcibly stopped. When such an abnormality occurs, even if the discharge circuit described above is simply connected to an electric circuit, the potential of the part to which the discharge circuit is connected can be reduced, but the potential of other parts is reduced. I can't.

As described above, in the above-described device, there is a possibility that the potential of each part of the electric circuit cannot be appropriately reduced when the device including the electric circuit is abnormal.
The present invention has been made in view of such circumstances, and an object of the present invention is to provide an electric circuit discharge system that can suitably lower the potential of each part of the electric circuit when an abnormality occurs.

Hereinafter, means for achieving the above-described object and its operation and effects will be described.
The invention according to claim 1 is applied to an electric circuit that is connected to two capacitors and operates by supplying power from a power source, and stops power supply from the power source to the electric circuit when an abnormality is detected. In a discharge system for forcibly discharging the electric charge stored in the capacitor by a discharge circuit connected to the electric circuit through operation of a switch, the discharge circuit is connected in parallel to each of the two capacitors. An anode connection path in which the switch and the discharge resistor are connected in series, and the anodes of the two capacitors are connected to one of the switch and the discharge resistor through different paths, respectively. The gist is to have.

  In an apparatus in which the anode of two capacitors and a discharging resistor are connected through a common path when an abnormality is detected, if the path connecting the anodes of each capacitor in the electrical circuit is divided due to the occurrence of an abnormality, Alternatively, the anodes of the capacitors and the discharge circuit are not connected to each other, so that the charges stored in the capacitors cannot be properly discharged.

  In this regard, according to the above configuration, since the anodes of the two capacitors are separately connected to the discharging resistor through different paths, there is a path connecting between the anodes of the capacitors in the electric circuit when an abnormality occurs. Even if it is divided, the anode of the capacitor and the discharging resistor can be connected via the anode connection path. Therefore, the electric charge stored in each capacitor at the time of abnormality detection can be appropriately discharged by the discharging resistor, and the potential of each part of the electric circuit can be suitably reduced.

  According to a second aspect of the present invention, in the electrical circuit discharge system according to the first aspect, the switch is configured such that one anode of the two capacitors, the other anode, and the discharge resistor are individually connected. The one anode, the other anode, and the discharging resistor are not connected before the abnormality is not detected and are connected to each other when the abnormality is detected. The gist.

  In the above configuration, the operation state of the switch of the discharge circuit when the abnormality is not detected is in a state where the anodes of the two capacitors are not connected to the discharge resistor, and the anodes of the capacitors are also connected to each other. The connection is not established. Therefore, even though a discharge system is constructed by a discharge circuit including a switch, the discharge circuit affects the characteristics of the two capacitors when no abnormality is detected in the discharge system, that is, when the switch is not operating. It is possible to make a structure that hardly gives. Therefore, according to the above configuration, when the discharge system is applied to the electric circuit, the discharge system may be simply added to the existing electric circuit, and the discharge system can be easily used.

  According to a third aspect of the present invention, in the electrical circuit discharge system according to the first or second aspect, the discharge circuit has different anodes of the two capacitors on one of the switch and the discharge resistor. In addition to the anode connection path connected by a path, the gist of the invention is that the other of the switch and the discharge resistor has a cathode connection path for connecting the cathodes of the two capacitors by different paths. To do.

  In a device in which the cathode of two capacitors and a discharging resistor are connected through a common path when an abnormality is detected, if the path connecting the cathodes of each capacitor in the electric circuit is interrupted due to the occurrence of an abnormality, Alternatively, the cathodes of the capacitors and the discharge circuit are not connected to each other, so that the charges stored in the capacitors cannot be properly discharged.

  In this regard, according to the above configuration, since the cathodes of the two capacitors are separately connected to the discharging resistor through different paths, there is a path connecting between the cathodes of the capacitors in the electric circuit when an abnormality occurs. Even if it is divided, the cathode of the capacitor and the discharging resistor can be connected via the cathode connection path. Therefore, the charge stored in each capacitor at the time of abnormality detection can be properly discharged by the discharging resistor.

  According to a fourth aspect of the present invention, in the electrical circuit discharge system according to any one of the first to third aspects, the switch is driven by an explosive actuator that operates when the abnormality is detected. This is the gist.

  According to the above configuration, the discharge circuit to the electric circuit can be operated through the operation of a switch that can be operated quickly as compared with other switches such as an electromagnetic switch driven by an explosive actuator. The connection can be made, and the charge stored in the capacitor can be quickly discharged.

  According to a fifth aspect of the present invention, in the electric circuit discharge system according to any one of the first to fourth aspects, the power source is a storage battery, and the storage battery and the electric circuit are mounted on a vehicle. The discharge system is configured to stop the power supply from the storage battery to the electric circuit by disconnecting the connection between the storage battery and the electric circuit through the operation of a circuit breaker when the abnormality is detected. The gist.

  In a vehicle equipped with a storage battery and an electric circuit, when an abnormality such as a collision of the vehicle is detected, the connection between the storage battery and the electric circuit is interrupted through the operation of the circuit breaker, and the power supply to the electric circuit is forced There has been proposed an apparatus for stopping the system. Also, in such a device, in order to suppress leakage from the electric circuit at the time of a vehicle collision, a discharge system for discharging electric charge stored in the electric circuit has been proposed.

  According to the said structure, the electric charge stored in the capacitor | condenser which comprises the electric circuit mounted in such a vehicle can be discharged appropriately, and the electric potential of each part of the electric circuit can be reduced suitably.

  A sixth aspect of the present invention is the electrical circuit discharge system according to the fifth aspect, wherein the electric circuit includes a motor for driving the vehicle and a drive circuit for driving the motor. And

  An electric circuit including a traveling motor and a drive circuit is mounted on an electric vehicle using only the electric motor as a vehicle drive source, a hybrid vehicle using an internal combustion engine and an electric motor as a vehicle drive source, or the like. In such a vehicle, since the voltage applied to the electric circuit is likely to be high, the demand for suppressing leakage from the electric circuit is likely to be high.

According to the said structure, the electric potential of each part of the electric circuit mounted in such a vehicle can be reduced suitably.
According to a seventh aspect of the present invention, in the electric circuit discharge system according to the fifth or sixth aspect, the electric circuit includes a converter circuit that boosts a voltage of the storage battery, and the two capacitors are The gist of the present invention is the first capacitor to which the input voltage of the converter circuit is applied and the second capacitor to which the output voltage of the converter circuit is applied.

  In an electric circuit provided with a converter circuit, a capacitor to which an input voltage is applied and a capacitor to which an output voltage is applied are often provided. According to the above configuration, the charges stored in the capacitor to which the input voltage of the converter circuit is applied and the capacitor to which the output voltage is applied can be suitably discharged.

  According to the present invention, the potential of each part of the electric circuit can be suitably lowered during an abnormality.

BRIEF DESCRIPTION OF THE DRAWINGS Schematic which shows schematic structure of the vehicle to which the discharge system of the electric circuit concerning one embodiment which actualized this invention is applied. The circuit diagram which shows the electric circuit concerning this Embodiment. [A] and [b] A circuit diagram showing a connection mode of a discharge circuit to a drive circuit. Sectional drawing which shows the cross-section of [a] and [b] switch. The circuit diagram which shows the connection aspect to the drive circuit of the discharge circuit of a modification.

Hereinafter, a discharge system for an electric circuit according to an embodiment of the present invention will be described.
FIG. 1 shows a schematic configuration of a vehicle to which an electric circuit discharge system according to the present embodiment is applied.

  As shown in FIG. 1, an internal combustion engine 11 is mounted on the vehicle 10. An output shaft 12 of the internal combustion engine 11 is connected to an axle 15 via an electric motor 13 and a power transmission mechanism 14. A driving wheel 16 is connected to the axle 15. The power transmission mechanism 14 is constituted by a planetary gear mechanism or the like, and transmits the rotational torque of the output shaft 12 of the internal combustion engine 11 and the rotational torque of the electric motor 13 to the axle 15. In the present embodiment, both the internal combustion engine 11 and the electric motor 13 function as a vehicle drive source that generates rotational torque to be applied to the axle 15. Further, as the electric motor 13, a three-phase AC type rotating machine is adopted.

  The vehicle 10 is provided with a drive device 17 for driving the electric motor 13. The drive device 17 includes a converter 18 and an inverter 19. The converter 18 boosts the power input from the storage battery 20 and outputs the boosted power to the inverter 19. The inverter 19 converts the input DC power into AC power suitable for driving the electric motor 13 and then outputs the AC power to the electric motor 13.

  For example, the vehicle 10 is provided with an electronic control device 21 mainly composed of a microcomputer. The electronic control device 21 captures output signals from various sensors. As various sensors, for example, an accelerator sensor 22 for detecting the amount of depression of an accelerator pedal (not shown), a speed sensor 23 for detecting the traveling speed of the vehicle 10, an abnormality (specifically, a collision) For example, a collision sensor 24 is provided.

  The electronic control unit 21 takes in the output signals of these sensors and performs various calculations based on these signals. Based on the calculation results, the operation control of the internal combustion engine 11, the operation control of the converter 18, the operation control of the inverter 19, etc. Various controls related to the driving of the vehicle 10 are executed.

Such various controls are basically executed based on the following ideas.
For example, when the vehicle 10 is caused to travel by the torque generated by the internal combustion engine 11 such as when the vehicle 10 is started or when the vehicle is lightly loaded, the electric motor is supplied by the power supply from the storage battery 20 when the operation efficiency of the internal combustion engine 11 is low. 13 is driven, and the vehicle 10 is driven by the torque generated by the electric motor 13. On the other hand, in a situation where the internal combustion engine 11 can be operated with high efficiency, such as during steady running of the vehicle 10, the internal combustion engine 11 is operated and the vehicle 10 travels with the torque generated by the internal combustion engine 11. On the other hand, in a situation where a large torque is required for traveling of the vehicle, such as when the vehicle 10 is accelerating, the internal combustion engine 11 is operated and the electric motor 13 is driven by the power supply from the storage battery 20, and these internal combustion engines are driven. 11 and the torque generated by the electric motor 13 causes the vehicle 10 to travel.

In FIG. 2, the electric circuit which consists of the said electric motor 13, the drive device 17, and the storage battery 20 is shown.
As shown in FIG. 2, the storage battery 20 is connected to the converter 18. A first capacitor 31 is provided between the positive electrode and the negative electrode of the storage battery 20. The first capacitor 31 suppresses fluctuations in the voltage input from the storage battery 20 to the converter 18.

  The converter 18 includes two switching elements (specifically, insulated gate bipolar transistors) 32 and 33 connected in series. One diode 34, 35 is connected in parallel to each switching element 32, 33. The voltage (for example, 200 volts) of the storage battery 20 is applied to one of the switching elements 32 and 33 (specifically, between the drain terminal and the source terminal of the switching element 33). The positive electrode of the storage battery 20 and the switching element 33 (specifically, a drain terminal) are connected via a reactor 36. A second capacitor 37 is connected between both ends of the switching elements 32 and 33 connected in series (specifically, between the drain terminal of the switching element 32 and the source terminal of the switching element 33).

  In the operation control of the converter 18, the operation of the switching elements 32 and 33 is controlled. Thereby, using the characteristic of the reactor 36, a voltage (for example, 650 volts) higher than the voltage of the storage battery 20 is output between both ends of the switching elements 32 and 33 connected in series. Note that the fluctuation of the output voltage of the converter 18 is suppressed by the second capacitor 37. In the present embodiment, a circuit constituted by switching elements 32 and 33, diodes 34 and 35, reactor 36, and second capacitor 37 functions as a converter circuit.

  The output voltage of the converter 18 is input to the inverter 19. The inverter 19 incorporates a three-phase bridge rectifier circuit constituted by six switching elements (specifically, insulated gate bipolar transistors) 38. The inverter 19 is connected to the electric motor 13. Each switching element 38 is connected in parallel with one diode 38a.

  In the operation control of the inverter 19, the operation of each switching element 38 is controlled. Thereby, the DC power input from the converter 18 is converted into AC power suitable for driving the motor 13 and supplied to the motor 13. Through the operation control of the inverter 19, the electric motor 13 is driven in a form suitable for the driving state of the vehicle 10.

  By the way, when the vehicle 10 is damaged due to a collision or the like, there is a risk of leakage from an electric circuit including the electric motor 13, the driving device 17, the storage battery 20, and the like. In a vehicle in which an internal combustion engine and an electric motor are mounted as a vehicle drive source, such as the vehicle 10 described above, a so-called hybrid vehicle, the voltage applied to the electric circuit tends to be high, so that leakage from the electric circuit is suppressed. The demand is likely to be high. Therefore, in the present embodiment, in order to suppress such leakage, a circuit breaker for cutting off the connection between the storage battery 20 and the drive device 17 (specifically, the drive circuit 30 for driving the electric motor 13) in the event of a collision of the vehicle 10. 25 is provided. And when the collision of the vehicle 10 is detected based on the output signal of the collision sensor 24, the circuit breaker 25 is operated, whereby the power supply from the storage battery 20 to the drive circuit 30 is stopped.

  Here, since the drive device 17 of the present embodiment includes the first capacitor 31 and the second capacitor 37, the first capacitor 31 is in operation (specifically, when power is supplied from the storage battery 20). In addition, electric charge is stored in the second capacitor 37. Therefore, when the power supply from the storage battery 20 to the driving device 17 is stopped simply by operating the circuit breaker 25, the potential of the driving circuit 30 is kept unnecessarily high.

  In view of this point, in the present embodiment, when a collision of the vehicle 10 is detected, the circuit breaker 25 is activated to stop the power supply from the storage battery 20, and the discharging resistor 41 is connected. The first capacitor 31 and the second capacitor 37 are connected in parallel. As a result, since the electric charge stored in the first capacitor 31 and the second capacitor 37 is discharged by the resistor 41, the potential of each part of the drive circuit 30 is held in an unnecessarily high state. It can be suppressed.

  FIG. 3 shows the discharge circuit 40 of the present embodiment. 3A shows the discharge circuit 40 when the switch 50 is not operated (OFF), and FIG. 3B shows the discharge circuit 40 when the switch 50 is operated (ON). Yes.

As shown in FIGS. 3A and 3B, the switch 50 is connected to the anode of the first capacitor 31, the anode of the second capacitor 37, and the resistor 41.
Specifically, the anode of the first capacitor 31 is connected to the switch 50 via the first connection path 42, and the anode of the second capacitor 37 is connected to the switch 50 via the second connection path 43. . Thus, in the present embodiment, the anode of the first capacitor 31 and the anode of the second capacitor 37 are connected to the switch 50 through different paths. Both the first connection path 42 and the second connection path 43 are formed of a member (specifically, a cable or a metal plate) different from the members constituting the drive circuit 30. The portion of the first connection path 42 on the first capacitor 31 side is connected to a portion of the drive circuit 30 that is as close as possible to the anode of the first capacitor 31. Furthermore, the portion of the second connection path 43 on the second capacitor 37 side is connected to a portion as close as possible to the anode of the second capacitor 37 in the drive circuit 30. In the present embodiment, the first connection path 42 and the second connection path 43 function as an anode connection path.

  Further, the discharging resistor 41 is disposed so as to connect the grounding portion 39 (specifically, the portion connected to the negative electrode of the storage battery 20 in the converter 18) in the drive circuit 30 and the switch 50. ing.

  As described above, the discharge circuit 40 according to the present embodiment is a circuit in which the resistor 41 and the switch 50 are connected in series to be connected in parallel to the first capacitor 31 and the second capacitor 37, respectively. Yes.

The switch 50 operates as follows according to the presence or absence of a collision of the vehicle 10 detected by the collision sensor 24.
First, as shown in FIG. 3A, when the collision of the vehicle 10 is not detected, the switch 50 does not operate, and the anode of the first capacitor 31, the anode of the second capacitor 37, and the resistor 41 are mutually connected. The connection is not established.

  Therefore, although the discharge circuit 40 for discharging the first capacitor 31 and the second capacitor 37 is provided, when the collision of the vehicle 10 is not detected, the first capacitor 31 and the second capacitor 37 are included. The discharge circuit 40 has little influence on the characteristics of the drive circuit 30 (see FIG. 2). Therefore, when the discharge circuit 40 is provided to discharge the first capacitor 31 and the second capacitor 37, the discharge system including the discharge circuit 40 can be applied to the drive circuit 30 without changing the drive circuit 30. it can. As described above, according to the present embodiment, the discharge system can be applied to the drive circuit 30 by simply adding the discharge system including the discharge circuit 40 to the drive circuit 30. Therefore, the discharge system is easy to use. Can be.

  Next, as shown in FIG. 3B, when a collision of the vehicle 10 is detected, the switch 50 is activated, and the discharge circuit 40 is connected to the anode of the first capacitor 31, the anode of the second capacitor 37, and the resistance. The circuit is connected to each other. Specifically, the resistor 41 is connected between the anode and the cathode of the first capacitor 31, and the resistor 41 is also connected between the anode and the cathode of the second capacitor 37. . Then, as indicated by the arrows in the figure, both the electric charge stored in the first capacitor 31 and the electric charge stored in the second capacitor 37 are discharged through the resistor 41. As a result, the potential of each part of the drive circuit 30 decreases.

  As the resistor 41, a resistor having a characteristic capable of sufficiently discharging the charges stored in the capacitors 31 and 37 within a desired time (for example, several minutes) is employed.

  In the discharge circuit 40 of the present embodiment, when the switch 50 is not in operation, the anode of the first capacitor 31 and the anode of the second capacitor 37 are not connected to each other (the state shown in FIG. 3A). When 50 is activated, the anode of the first capacitor 31 and the anode of the second capacitor 37 are connected to each other (the state shown in FIG. 3B). Since such a discharge circuit 40 is employed, the voltage (V1) applied to the first capacitor 31 and the voltage (V2) applied to the second capacitor in the normal time (FIG. 3A) are different from each other. In the circuit 30, the charges stored in the capacitors 31 and 37 when the collision of the vehicle 10 is detected can be discharged by the operation of the common switch 50.

  Here, in the drive circuit 30 (FIG. 2) of the present embodiment, the part on the inverter 19 side from the cathode terminal of the diode 35 connected in parallel to the switching element 33 of the converter 18 and the ground part 39 of the drive circuit 30. The first capacitor 31 and the second capacitor 37 can also be discharged by connecting a switch and a discharging resistor between them.

  However, in such an apparatus in which the capacitors 31 and 37 and the discharging resistor are connected through a common path, the anodes of the capacitors 31 and 37 in the drive circuit 30 are caused by a collision of the vehicle 10 or an element failure. When the connecting path is divided, one (or both) anodes of the capacitors 31 and 37 may not be connected to the discharging resistor. In this case, the charges stored in the capacitors 31 and 37 cannot be properly discharged.

  In this regard, in the present embodiment, the anode of the first capacitor 31 and the resistor 41 are connected via the first connection path 42, and the anode of the second capacitor 37 and the resistor 41 are connected to the second connection path. 43 is connected. Therefore, even when the path connecting the anodes of the capacitors 31 and 37 in the drive circuit 30 is divided due to the detection of the collision of the vehicle 10, the anodes of the capacitors 31 and 37 and the resistor 41 are connected to each other. The connection can be made via the first connection path 42 and the second connection path 43. Therefore, when a collision of the vehicle 10 is detected, the charges stored in the capacitors 31 and 37 can be properly discharged by the resistor 41, and the potential of each part of the drive circuit 30 can be suitably reduced. it can.

  Incidentally, when the breaker 25 is activated after the collision of the vehicle 10 is detected, the switch 50 is activated, so that the switch 50 is activated in a state where the breaker 25 is not activated. That is, it is possible to avoid a state in which the discharge circuit 40 is connected to the drive circuit 30 in a state where the storage battery 20 is connected to the drive circuit 30. In order to quickly execute the interruption of the power supply by the operation of the circuit breaker 25 and the discharge of the capacitors 31 and 37 by the operation of the switch 50, the circuit breakers 25 are detected when a collision of the vehicle 10 is detected. It is desirable to start the operation of the circuit breaker 25 and the switch 50 early without considering the operation sequence of the switch 50.

  In the present embodiment, the switch 50 that incorporates an explosive actuator that operates when a collision of the vehicle 10 is detected is employed. The switch 50 is driven through the operation of this actuator. Hereinafter, the specific structure of the switch 50 will be described.

  FIG. 4 shows the internal structure of the switch 50. 4A shows the internal structure of the switch 50 before operation of the actuator, and FIG. 4B shows the internal structure of the switch 50 after operation of the actuator.

As shown in FIGS. 4A and 4B, a substantially cylindrical space (cylinder portion 52) is formed inside the case 51 of the switch 50.
The switch 50 has terminals formed at positions separated from each other, and three terminals (a first terminal 53, a second terminal 54, and a terminal for connecting the inside of the cylinder portion 52 and the outside of the case 51). A third terminal 55) is provided. A part of the first terminal 53 (first contact 53a) and a part of the second terminal 54 (second contact 54a) are respectively located on the inner peripheral surface of the cylinder part 52 in the axial direction of the cylinder part 52 ( It is disposed so as to be exposed at one end portion (top portion 52a) in FIG. The third terminal 55 is arranged such that a part (third contact 55 a) is exposed at the top 52 a of the inner surface of the cylinder portion 52. The first terminal 53 is connected to the anode of the second capacitor 37, and the second terminal 54 is connected to the resistor 41. The third terminal 55 is connected to the anode of the first capacitor 31.

  Further, the switch 50 incorporates an explosive actuator 56. The actuator 56 is formed in a substantially cylindrical shape and is disposed inside the cylinder portion 52, and a gas generating portion 58 that generates combustion gas by ignition combustion of explosives in response to a signal input from the electronic control device 21. And. The gas generator 58 is attached to the bottom 52 b so as to be disposed between one end (bottom 52 b) in the axial direction in the cylinder 52 and the operating portion 57.

  Then, when the explosive is ignited and combusted in the gas generating section 58, the operating section 57 is pressed by the combustion gas generated thereby, so that the operating section 57 moves from the bottom 52b side to the top 52a inside the cylinder section 52. To move. In general, such explosive actuators can be driven more quickly than other switches such as electromagnetic switches, are inexpensive, and have high operational reliability. In the present embodiment, the switch 50 is driven using such an explosive actuator 56.

Hereinafter, an operation mode of the switch 50 will be described.
As shown in FIG. 4A, before the actuator 56 is actuated, the actuating portion 57 is disposed at a position where it does not contact the first contact 53a, the second contact 54a, and the third contact 55a. Therefore, before the operation of the actuator 56, the switch 50 is in a state where the respective contacts (the first contact 53a, the second contact 54a, and the third contact 55a) are not connected to each other.

  On the other hand, as shown in FIG. 4B, when the actuator 56 is actuated, the actuating portion 57 moves to a position where it contacts all of the first contact 53a, the second contact 54a, and the third contact 55a. . The operating portion 57 is made of a conductive material (for example, a material having high electrical conductivity such as an iron-based material). Therefore, after the operation of the actuator 56, each contact point of the switch 50 is connected by the operation unit 57.

  Here, the switch 50 is formed in a tapered shape such that the outer surface shape of the portion of the operating portion 57 on the front side in the moving direction (the top portion 52a side) is directed toward the front side in the moving direction. Similarly, the inner surface shape of the top portion 52a side of the cylinder portion 52 of the switch 50 is formed in a taper shape that tapers toward the front side in the moving direction of the operating portion 57. And both the 1st contact 53a and the 2nd contact 54a are formed so that it may be exposed in the shape in alignment with the inner surface of the cylinder part 52 in the part formed in the taper shape of the cylinder part 52. As shown in FIG. That is, the first contact point 53a and the second contact point 54a are formed in such a shape that the interval becomes narrower toward the front side in the moving direction of the operating portion 57.

  In the switch 50, when the operating portion 57 is moved by the operation of the actuator 56, the portion on the front side in the moving direction of the operating portion 57 is fitted into the portion on the top portion 52 a side of the cylinder portion 52. Therefore, at this time, the portion of the operating portion 57 on the front side in the moving direction is fitted between the first contact 53a and the second contact 54a. As a result, both the surface pressure at the contact portion between the operating portion 57 and the first contact 53a and the surface pressure at the contact portion between the operating portion 57 and the second contact 54a are increased. The connection of the contact 53a, the second contact 54a, and the third contact 55a is ensured.

As described above, according to the present embodiment, the effects described below can be obtained.
(1) As the discharge circuit 40, a circuit in which the switch 50 and the resistor 41 are connected in series is connected in parallel to the first capacitor 31 and the second capacitor 37, respectively. Further, the anode of the first capacitor 31 and the anode of the second capacitor 37 are connected to the switch 50 through different paths. Therefore, even when the path connecting the anodes of the capacitors 31 and 37 in the drive circuit 30 is divided due to the collision of the vehicle 10 or the like, the anodes of the capacitors 31 and 37 and the resistor 41 are connected to the first. The connection can be made via the connection path 42 and the second connection path 43. Therefore, when the collision of the vehicle 10 is detected, the electric charges stored in the capacitors 31 and 37 can be properly discharged by the resistor 41, and the potential of each part of the drive circuit 30 can be suitably reduced. .

  (2) As the switch 50, the anode of the first capacitor 31, the anode of the second capacitor 37, and the resistor 41 are not connected to each other when the collision of the vehicle 10 is not detected, and are connected when the abnormality is detected. It was made to provide. Therefore, by simply adding a discharge system including the discharge circuit 40 to the drive circuit 30, the discharge system can be applied to the drive circuit 30, and the discharge system can be easily used.

  (3) The switch 50 that is driven by the explosive actuator 56 that operates when a collision of the vehicle 10 is detected is provided. For this reason, the discharge circuit 40 can be connected to the drive circuit 30 through the operation of the switch 50 that can be operated more quickly than other switches such as an electromagnetic switch, and is stored in the capacitors 31 and 37. The generated charge can be discharged quickly.

  (4) The electric charge stored in the capacitors 31 and 37 constituting the drive circuit 30 mounted on the vehicle 10 can be properly discharged, and the potential of each part of the drive circuit 30 can be suitably reduced. .

  (5) Since the electric motor 13 for traveling is provided, in the vehicle 10 in which the demand for suppressing leakage from the electric circuit is likely to increase, the potential of each part of the electric circuit can be suitably reduced.

  (6) The electric charge stored in the first capacitor 31 to which the input voltage of the converter 18 is applied and the second capacitor 37 to which the output voltage is applied can be suitably discharged.

The embodiment described above may be modified as follows.
As shown in FIG. 5, the cathode of the first capacitor 31 is connected to the resistor 41 via the third connection path 61, and the cathode of the second capacitor 37 is connected to the resistor via the fourth connection path 62. 41 may be connected.

  Here, in a device in which the cathode of each of the capacitors 31 and 37 and the resistor 41 are connected through a common path when a collision of the vehicle 10 is detected, each capacitor in the drive circuit 30 in accordance with the collision of the vehicle 10 or the like. When the path connecting the cathodes 31 and 37 is divided, one (or both) cathodes of the capacitors 31 and 37 may not be connected to the discharge circuit. In this case, the electric charges stored in the capacitors 31 and 37 cannot be properly discharged.

  In this regard, in the above configuration, the cathode of the first capacitor 31 and the cathode of the second capacitor 37 are connected to the resistor 41 through different paths. Therefore, even when the path connecting the cathodes of the capacitors 31 and 37 in the drive circuit 30 is divided due to the collision of the vehicle 10 or the like, the cathode of the capacitors 31 and 37 and the resistor 41 are connected. It can be maintained by the third connection path 61 and the fourth connection path 62. Therefore, when the collision of the vehicle 10 is detected, the charges stored in the capacitors 31 and 37 can be properly discharged by the resistor 41.

  In order to obtain such an operational effect, it is desirable to connect the portion on the first capacitor 31 side of the third connection path 61 to a portion as close as possible to the cathode of the first capacitor 31 in the drive circuit 30. Further, it is desirable that the portion of the fourth connection path 62 on the second capacitor 37 side is connected to a portion as close as possible to the cathode of the second capacitor 37 in the drive circuit 30. In the above configuration, the third connection path 61 and the fourth connection path 62 function as cathode connection paths.

In place of the switch 50, a switch other than the type of switch driven by the operation of the explosive actuator, such as an electromagnetic switch, may be employed.
If it is an electric device that becomes an electric resistance by connecting to an electric circuit, it is adopted as a discharging resistor for discharging the electric charge stored in the first capacitor 31 and the second capacitor 37 instead of the resistor 41. can do.

  A discharge that forcibly discharges the charge stored in two capacitors connected in parallel, such as two capacitors that both receive the input voltage of the converter 18 and two capacitors that both receive the output voltage of the converter 18 The discharge system according to the above embodiment can be applied to the system after the configuration thereof is appropriately changed. In this configuration, a circuit connected in this order, such as an anode of each capacitor, a discharge resistor, a switch, and a cathode of each capacitor, can be employed as the discharge circuit.

  If the electric circuit includes at least two capacitors, the electric discharge system according to the above-described embodiment can be applied to an electric circuit other than the electric circuit including the motor 13 for driving the vehicle, the converter 18, the inverter 19, and the storage battery 20. It is possible to apply after changing the configuration as appropriate. Examples of such an electric circuit include an electric circuit composed of a storage battery, an inverter, and an electric motor for driving the vehicle, and an electric circuit composed of a storage battery, a drive circuit, and an electric compressor for an air conditioner.

-This invention can also be applied to the discharge system which discharges the electric charge stored in these capacitors in the electric circuit provided with three or more capacitors.
The present invention can be applied not only to an electric circuit mounted on a vehicle but also to an electric circuit provided in a device installed in a factory or the like. In this case, an abnormality relating to the device such as an abnormality in the electric circuit itself or an abnormality in the device is detected, and the supply of power from the power source to the electric circuit is stopped based on the detection, and the charge accumulated in the capacitor is What is necessary is just to perform forced discharge.

  The present invention can be applied not only to an electric circuit to which a storage battery is connected as a power source but also to an electric circuit to which a commercial power source is connected as a power source.

  DESCRIPTION OF SYMBOLS 10 ... Vehicle, 11 ... Internal combustion engine, 12 ... Output shaft, 13 ... Electric motor, 14 ... Power transmission mechanism, 15 ... Axle, 16 ... Drive wheel, 17 ... Drive device, 18 ... Converter, 19 ... Inverter, 20 ... Storage battery, DESCRIPTION OF SYMBOLS 21 ... Electronic control unit, 22 ... Accelerator sensor, 23 ... Speed sensor, 24 ... Collision sensor, 25 ... Circuit breaker, 30 ... Drive circuit, 31 ... First capacitor, 32, 33 ... Switching element, 34, 35 ... Diode, 36 ... Reactor, 37 ... Second capacitor, 38 ... Switching element, 39 ... Grounding part, 40 ... Discharge circuit, 41 ... Resistor, 42 ... First connection path, 43 ... Second connection path, 50 ... Switch, 51 ... Case, 52 ... Cylinder, 52a ... Top, 52b ... Bottom, 53 ... First terminal, 53a ... First contact, 54 ... Second terminal, 54a ... Second contact, 55 ... Third terminal, 55a Third contact, 56 ... actuator, 57 ... operation unit, 58 ... gas generator, 61 ... third connection path, 62 ... fourth connection path.

Claims (7)

It is applied to an electric circuit that is connected to two capacitors and operates by supplying power from a power source. When an abnormality is detected, the power supply from the power source to the electric circuit is stopped and the electric circuit is operated through operation of a switch. In the discharge system forcibly discharging the charge stored in the capacitor by a connected discharge circuit,
The discharge circuit is connected in parallel to each of the two capacitors, the switch and the discharge resistor are connected in series, and the switch and the discharge resistor An electrical circuit discharge system comprising an anode connection path for connecting anodes of the two capacitors through different paths on one side. The electrical circuit discharge system according to claim 1,
The switch is formed by connecting one anode, the other anode, and the discharge resistor of the two capacitors, and the one anode, the other anode, and the discharge resistor. Are not connected before the abnormality is not detected, but are connected to each other when the abnormality is detected. The electric circuit discharge system according to claim 1 or 2,
In addition to the anode connection path for connecting the anodes of the two capacitors to different ones of the switch and the discharge resistor, respectively, the discharge circuit is connected to the other of the switch and the discharge resistor. An electric circuit discharge system comprising a cathode connection path for connecting the cathodes of the two capacitors through different paths. In the electrical circuit discharge system according to any one of claims 1 to 3,
The electrical circuit discharge system according to claim 1, wherein the switch is driven by an explosive actuator that operates when the abnormality is detected. In the electrical circuit discharge system according to any one of claims 1 to 4,
The power source is a storage battery;
The storage battery and the electric circuit are mounted on a vehicle,
In the discharge system, the supply of power from the storage battery to the electric circuit is stopped by disconnecting the connection between the storage battery and the electric circuit through the operation of a circuit breaker when the abnormality is detected. Electric circuit discharge system. The electrical circuit discharge system according to claim 5,
The electric circuit comprises an electric motor for driving the vehicle and a drive circuit for driving the electric motor. The electric circuit discharge system according to claim 5 or 6,
The electrical circuit comprises a converter circuit that boosts the voltage of the storage battery,
The electrical discharge system according to claim 1, wherein the two capacitors are a first capacitor to which an input voltage of the converter circuit is applied and a second capacitor to which an output voltage of the converter circuit is applied.

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